Pivot-straightening tool.



J. F. DOLLES PIVOT STRAIGHTENING TOOL.

APPLICATION FILED lUNE 22, 1915.

1,12,65. Patented May 9,1916.

WITNESSES MENTOR 1 aai..z

JOSEPH FRANCIS DOLLES, OF CHESTER, ILLINOIS.

PIVOT-STRAIGHTENING TOOL.

Specification of Letters Patent.

Patented Ma a, 19 16.

Application filed June 22, 1915. Serial No. 35,660.

To all whom it may concern Be it known that I, Josnrn F. DOLLES, a citizen of the United States, and a resident of Chester, in the county of Randolph and State of Illinois, have invented certain new and useful Improvements in Pivot-Straightening Tools, of which the following is a specification.

My invention relates to means for straightening bent pivots on watch wheels, and one of the main objects thereof is to provide a tool or attachment for a watchmakers lathe which will accomplish this result without any danger of breaking the pivot or of injuring the wheel to which it is connected.

My invention is fully described in the following specification, of which the accompanying drawings form a part, in which like characters refer to like parts in each of the views, and in which Figure 1 is a central, longitudinal, section taken through a tool constructed in accordance with my invention, in inoperative or relaxed position; Fig. 2 is a section taken on the line 2-2 of Fig. 1; Fig. 3 is a section taken on the line 3-3 of Fig. 1; and Fig. 4: is a view of a lathe with my tool in position for use, a watch wheel being also shown.

In the drawings forming a part of this application I have shown one embodiment of my invention comprising a body member 5 and a nut 6 screw threaded thereon at 7, said body member having an outwardly and forwardly flared head 8 against which the forward end 9 of the nut bears.

The head 8 is provided with a transversely and longitudinally arranged slot 10 extending from the forward end thereof to a point midway, approximately, of the length of the body member 5, a transverse bore 11 being provided to insure spring to the arms 12 and 13 formed by said slot, and with a transverse bore 14 adjacent the forward end of said head, the slot and bores being in the same axial plane of the body member.

The body member is provided with a tapered spindle 15 adapted for attachment to the tailstock spindle 16 of a watchmakers lathe, whereby said body member may be held against rotation.

In practice, the wheel having the bent pivot is firmly secured in the chuck 17 or headstock spindle of the lathe, the wheel being shown at 18, and the chuck and wheel may be then rotated by belting or in any desired manner common to lathes. I

The tailstock spindle is advanced until the pivot of the watch wheel enters the slot 10 between the arms 12 and 13 at this time spread apart. The pivot may revolve in the slot 10 and, if greatly bent, may touch the lnner surfaces of the arms in such revolution, which contact has a tendency to bend the pivot back to normal position in a gradual manner as will be described. At first, this contact will be very slight if there is any at all but, as the nut 6 is screwed forwardly on the body member -5 the forward end of the nut tends to force the arms 12 and 13 toward each other because of the tapered head 8, thus narrowing the slot 10 at its forward end and causing the arms to advance gradually toward the axis of the tool and lathe at the same speed and in the same degree.

As the nut is advanced by the operator in a gradual manner, this contact between the pivot and the inner surfaces of the arms becomes more and more pronounced, thereby moving the pivot more and more toward its normal position on the axis of the wheel; the advancing of the nut is continued until the arms are in constant contact with the pivot, which condition can only obtain when the pivot is on the axis of the lathe and tool, the bore 14 serving as a peep hole for the operator to observe the operation. While this operation is gradually performed it is also very quickly performed, the experience and skill of the operator guiding him as to the speed of advancement of the nut 6, and any equivalent for the nut may be provided, as long as the broad idea of the slot to receive the pivot, and the means for gradually narrowing said slot, is maintained.

My invention is very simple though highly eflicient; it is readily connected with a lathe and as readily disconnected therefrom; there are no parts to be lost, and even an unskilled person may use the same and accomplish the best results; and the device is comparatively inexpensive.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A tool for straightening the pivots of watch wheels, comprising a body member provided with a longitudinally arranged slot on the axis thereof to form spring arms between which said pivot is adapted to be arranged, means for moving said arms toward the axis of said tool, and means for attaching said tool to a relatively fixed por tion of a lathe.

2. A tool for straightening the pivots of watch wheels, comprising a body member provided with a longitudinally arranged slot on the axis thereof to form spring arms between which said pivot is adapted to be arranged, means for moving said arms toward the axis of said tool, and a spindle on said body member adapted for connection with the tailstock spindle of a lathe.

8. A tool for straightening the pivots of Watch Wheels, comprising a body member having a forwardly flared head provided with a longitudinal slot on the axis thereof to form spring arms, a nut threaded on said body member and bearing on said flared head for forcing said arms toward the axis of said tool, and a spindle for attachment with the tailstock spindle of a lathe.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOSEPH FRANCIS DOLLES.

Copies of this patent may be obtained for five cents each, by addressing the Oommissioner. of Patents, Washington, D. G. 

